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July 25, 2023 <br /> Lab No. : STK2339244 <br /> Live Oak Geo Environmental <br /> Customer No. : 3016608 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Nitrate Nitrogen 450ONO3F 07/13/2023:207687LFS ND mg/L 0 0.4 435 <br /> LCS mg/L 11.22 105% 80-120 <br /> MS mg/L 5.609 94.1% 66-125 <br /> (STK2339269-001) MSD mg/L 5.609 97.8% 66-125 <br /> MSRPD mg/L 2.5% :530.4 <br /> Definition <br /> LCS : Laboratory Control Standard/Sample-Prepared to verify that the preparation process is not affecting analyte recovery. <br /> MS : Matrix Spikes-A random sample is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix <br /> affects analyte recovery. <br /> MSD : Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyted.The recoveries are an <br /> indication of how that sample matrix affects analyte recovery. <br /> MSRPD : MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and <br /> analysis. <br /> ND : Non-detect-Result was below the DQO listed for the analyte. <br /> Explanation <br /> 435 Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. <br /> Page 5 of 5 Page 5 of 5 <br />